Lighting apparatus for vehicles

ABSTRACT

A lighting apparatus for vehicles with a number of semiconductor-based light sources and a projection device for generating the specified light distribution with a cut-off line. The projection device features a correction device with at least two lenses. The surface of at least one of the lenses is designed as a diffractive lens surface for achromatization in a visible wavelength range. The two lenses are made from different lens materials. The surfaces of at least two lenses are designed as refractive lens surfaces that have their optical power calculated based on a temperature range and/or expansion coefficient of the lens material of at least two lenses such that adding the optical power of the lenses yields a predefined total optical power of the correction device.

CROSS REFERENCE

This application claims priority to PCT Patent Application No.PCT/EP2015/068582, filed 12 Aug. 2015, which itself claims priority toGerman Application No. 10 2014 112937.7, filed 9 Sep. 2014, the entiretyof both of which are hereby incorporated by reference.

FIELD OF THE INVENTION

This invention is a lighting apparatus for vehicles with a number ofsemiconductor-based light sources and a projection device for generatingthe specified light distribution with a cut-off line.

BACKGROUND OF THE INVENTION

Patent DE 10 2010 027 322 A1 specifies a lighting apparatus for vehiclesthat features a number of light sources arranged in a matrix structureand a projection unit assigned to the light sources so a specified lightdistribution can be generated. The projection unit can feature asecondary optical component consisting of one lens and one primaryoptical component arranged between the secondary optical component andthe light sources. Unwanted color fringes often form at a cut-off lineof the light distribution generated by the projection unit. Especiallyin cases in which the projection unit features components made ofplastic, such as PMMA, PC or LSR, the refractive index of the projectionunit changes more substantially due to the temperature. Within therelatively wide temperature range of −50° C. through 150° C. in whichthe lighting apparatus is operated, the focal point shifts severalmillimeters. This causes the depiction of the cut-off line to be blurry.

U.S. Pat. No. 5,737,120 A stipulates a projection unit that consists oftwo lenses, wherein one of the two lenses has a diffractive lenssurface. However, the resulting achromatization relates to infraredradiation in a wavelength range of 8 μm through 12 μm. The two lensesare produced from different materials. This reduces thermal influences.A disadvantage of this well-known projection unit is that it cannot beused for lighting apparatus in the automotive sector.

SUMMARY OF THE INVENTION

Therefore, the purpose of this invention is to further develop alighting apparatus for vehicles with a number of semiconductor-basedlight sources and a projection device for generating the specified lightdistribution such that thermal and chromatic perturbations are reducedor offset.

In an effort to fulfill this purpose, this invention is included underthe broader term “Patent claim 1”, wherein

-   -   the projection device features a correction device with at least        two lenses, where the surface of at least one of the lenses is        designed as a diffractive lens surface for achromatization in a        visible wavelength range,    -   wherein the two lenses are made from different lens materials,    -   wherein the surfaces of at least two lenses are designed as        refractive lens surfaces that have their optical power        calculated based on a temperature range and/or expansion        coefficient of the lens material of at least two lenses such        that adding the optical power of the lenses yields a predefined        total optical power of the correction device.

The main advantage of this invention is that the inventive correctiondevice offsets top-level thermal and chromatic influences. The opticalpower of the optical system stabilizes. This process decouples thesystem from most thermal influences. Chromatic effects are reducedsubstantially, and this effect can be further optimized by choosing fromat least two different wavelengths within the light source spectrum.Though the differences between the refractive indices are greater withinthe visible wavelength range (380 nm through 780 nm), achromatizationwithin this spectral range is advantageous. The use of athermalizationis not limited to glass lens material. It can also used for plastic lensmaterials. Athermalization occurs in a temperature range from −50° C.through 150° C. This is the typical temperature range for vehiclelighting operation.

In a preferred embodiment of this invention, the correction devicefeatures a first lens and a second lens which each have a diffractivelens surface and a refractive lens surface. The diffractive lens surfaceand/or refractive lens surface can have a spherical or asphericaldesign. An aspherical design can compensate for spherical and otheraberrations. The shape of the correction device is specially designed tooptimize coupling of the two lenses, minimizing Fresnel losses as wellas adjustment and assembly work.

In a preferred embodiment of this invention, the sides of the first andsecond lenses facing one another are directly adjacent. Ideally, thecontact face is level with and perpendicular to the optical axis. Thesurface of the first lens facing toward the light source and the surfaceof the second lens facing away from the light source each have adiffractive lens surface and refractive lens surface. The diffractivestructure is applied to the curved area/surface, directly coupling bothlenses with one another on their flat sides. Fresnel losses on both lensbounding surfaces facing toward one another can be reduced because thelight does not have to travel through the air from the first lens tosecond lens. This reduces adjustment work because only one of the twolenses needs to be aligned with the rest of the system.

Further development of this invention has reduced Fresnel losses evenmore by inserting at least one material layer between the first andsecond lenses. This material has a refractive index that lies betweenthat of the first lens and that of the second lens.

In further development of this invention, the correction device isdesigned as a secondary optical component assigned to the light sourcesarranged in a matrix structure and also to the primary opticalcomponents positioned at the front that are assigned to the same lightsources. The correction device combines the features ofthermal/chromatic influence compensation and projection of light beamstransmitted from the light sources.

In further development of this invention, the correction device isdesigned as a primary optical component assigned to each of the lightsources arranged in a matrix structure. Ideally, a secondary opticalcomponent is arranged in front of the light sources and primary opticalcomponents in the main direction of the beam as a lens array. Ideally,in this embodiment, the correction device is used to compensate forthermal and chromatic influences. Preferably, the stipulated lightdistribution is projected through the secondary lens.

In further development of the invention, the optical power of therefractive lens surfaces is calculated by determining the ratio of onetype of optical power (the refractive optical power or diffractiveoptical power of various lenses to one other yielded from an Abbe orathermalization equation). The individual optical power values can evenbe determined using an equation for the total optical power.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference is now made more particularly to the drawings, whichillustrate the best presently known mode of carrying out the inventionand wherein similar reference characters indicate the same partsthroughout the views.

FIG. 1 is a schematic side view of a correction device (initialembodiment).

FIG. 2 is a schematic side view of this correction device (secondembodiment).

FIG. 3 is a schematic side view of a lighting apparatus with lightsources arranged in a matrix structure and the correction device as asecondary optical component.

FIG. 4 is a schematic side view of the lighting apparatus with lightsources arranged in a matrix structure and the correction device as aprimary optical component.

DETAILED DESCRIPTION OF THE DRAWINGS

A lighting apparatus for vehicles can be designed as headlamp in thefront area or as a combination rear lamp. At the front of a vehicle, thelighting apparatus can be used to generate low-beam light, glare-freehigh-beam light or other light distribution patterns, such as highwaylight, city driving light, etc. The light distribution typically has acut-off line.

To prevent formation of a color fringe at the cut-off line or to reducethermal influences resulting from the operating temperature of thelighting apparatus lying within a specified temperature range (−50° C.through 150° C.), a correction device (1) is integrated into thelighting apparatus. This correction device has a one-piece design inaccordance with the first embodiment of the invention (shown in FIG. 1).This correction device (1) is part of a projection unit that projectstransmitted light from a number of semiconductor-based light sources(not shown) according to the specified light distribution. In thissample embodiment, the correction device (1) is the projection device.

The correction device (1) features a first lens (2) on the side facingtoward the light source and a second lens (3) on the side facing awayfrom the light source. The second lens (3) is arranged in front of thefirst lens (2) in the main direction of the beam H.

The first lens (2) features a surface that faces toward one of the lightsources and consists of a refractive lens surface (4) and a diffractivelens surface (5). The refractive lens surface (4) is designed such thatthe corrective device (1) is athermal. The refractive lens surface (4)has a spherical design. Alternatively, it can be designed to beaspherical. The refractive lens surface (4) features an optical power ofφ_(ref,1) that bends the design inward. The diffractive lens surface (5)is structured such that the corrective device (1) is achromatic. Thediffractive lens surface (5) is designed as a Fresnel structure andfeatures an optical power of φ_(diff,1).

The surface on the side of the second lens (3) that faces away from thelight source bends outward. The surface features a refractive lenssurface (6) that is designed such that the corrective device isathermal. The refractive lens surface (6) features an optical power ofφ_(ref,2). The surface also features a diffractive lens surface (7) thatis structured such that the corrective device (1) is achromatic. Thediffractive lens surface (7) features a Fresnel structure with anoptical power of φ_(diff,2).

The sides of the first lens (2) and second lens (3) facing one anotherare directly adjacent. The sides of the first lens (2) and the secondlens (3) facing one another each have a flat surface (8 and 9). The twosurfaces (8, 9) run perpendicular to an optical axis (10) of thecorrection device (1). The surface (8) of the first lens (2) and thesurface (9) of the second lens (3) can be firmly bonded, particularlythrough adhesion. As such, the first lens (2) and second lens (3) form ahybrid lens.

The first lens (2) and second lens (3) are made from different materials(more specifically, from various plastic materials with differentexpansion coefficients).

One embodiment of the invention (not shown) also allows for a materiallayer to be inserted between the surface (8) of the first lens (2) andthe surface (9) of the second lens (3) that has a refractive index nthat lies between a refractive index n₁ of the first lens (2) and arefractive index n₂ of the second lens (3). In this case, there is alsono air medium between the first lens (2) and the second lens (3).

In a second embodiment of the correction device (1) (shown in FIG. 2), afirst lens (12) is arranged on a side facing toward the light source anda second lens (13) is arranged on a side facing away from the lightsource. In this arrangement, the second lens (13) is placed at adistance from the first lens (12). The side of the first lens (12)facing away from the light source is a refractive lens surface (14) bentinward and the side of this lens facing toward the light source is adiffractive lens surface (15). The refractive lens surface (14) featuresan optical power of φ_(ref,1) and the diffractive lens surface (15) anoptical power of φ_(diff,1). The surface of the first lens (12) facingtoward the light source is designed so that it is mostly level andperpendicular to the optical axis (10). The surface (Fresnel) structuresshown in FIG. 1 and FIG. 2 are enlarged for easier understanding and donot correspond to the actual dimensions and design.

In accordance with the first and second embodiments, identical functionsof the various lenses are assigned identical reference symbols.

A surface of the second lens (13) that is facing away from the lightsource is a refractive lens surface (16) that is bent outward andfeatures an optimal power of φ_(ref2). surface of the second lens (13)facing toward the light source is a diffractive lens surface (17) thatfeatures an optical power of φ_(diff,2). Like the surface of the firstlens (12) facing toward the light source, the surface of the second lens(13) facing toward the light source is designed and arranged so that itis mostly level and perpendicular to the optical axis (10).

The method for determining the optical power φ_(ref1), φ_(ref2),φ_(diff1), φ_(diff2) of the first lenses (2, 12) and second lenses (3,13) is described below using an example. In this example, thediffractive structure causes achromatization.

The equations (1), (2) are the starting point for the optical powervalues φ_(ref) and φ_(diff):

$\begin{matrix}{\phi_{ref} = \frac{n - 1}{R}} & (1) \\{\phi_{diff} = {\frac{2 \cdot \lambda}{r^{2} - \lambda^{2}}\underset{\_}{\propto}\frac{2 \cdot \lambda}{r^{2}}}} & (2)\end{matrix}$

This yields the total optical power φ of the correction device (1)

$\begin{matrix}{{\phi = {{\sum\limits_{i}\phi_{i}} = {{\sum\limits_{i = 1}^{2}\; \left( {\phi_{{ref},i} + \phi_{{diff},i}} \right)} = {{\left( {\frac{n_{1} - 1}{R_{1}} + \frac{2 \cdot \lambda_{0}}{r_{1}^{2}}} \right) + \left( {\frac{n_{2} - 1}{R_{2}} + \frac{2 \cdot \lambda_{0}}{r_{2}^{2}}} \right)}\overset{def}{=}\; {const}}}}},} & (3)\end{matrix}$

where R is the refractive index n and the curvature radius of the bentspherical surfaces and r is the zone radius of the first Fresnel zone ofthe diffractive surfaces

n ₁ :=n ₁(λ₀ ,T ₀)  (4)

R ₁ :=R ₁(T ₀)  (5)

n ₁ :=n(T ₀)  (6).

Achromatization is caused by the diffractive lens surfaces (5, 7 or 15,17) of the lenses (2, 3 or 12, 13). The following condition applies toboth lenses to ensure that two refractive lens surfaces (4, 6; or 14,16) and two diffractive lens surfaces (5, 7 or 15, 17) can be used tocorrect two wavelengths (Abbe equation):

$\begin{matrix}{{{\Delta\phi}_{i}\left( {\lambda,T_{0}} \right)} = {{{\frac{{n_{i}\left( \lambda_{1} \right)} - {n_{i}\left( \lambda_{2} \right)}}{{n_{i}\left( \lambda_{0} \right)} - 1} \cdot \phi_{{ref},i}} + {\frac{\lambda_{1} - \lambda_{2}}{\lambda_{0}} \cdot \phi_{{diff},i}}}\overset{def}{=}0}} & (7)\end{matrix}$

The following conditions must be met for athermalization(athermalization equation):

$\begin{matrix}{{{{\Delta\phi}_{i}\left( {\lambda_{0},T} \right)} = {\sum\limits_{i = 1}^{2}\; {\left( {{\left( {\frac{{n_{i}\left( T_{1} \right)} - {n_{i}\left( T_{0} \right)}}{{n_{i}\left( T_{0} \right)} - 1} - {\alpha_{i} \cdot \left( {T_{1} - T_{0}} \right)}} \right) \cdot \phi_{{ref},i}} - {2 \cdot \alpha_{i} \cdot \left( {T_{1} - T_{0}} \right) \cdot \phi_{{diff},i}}} \right)\overset{def}{=}0}}},} & (8)\end{matrix}$

where α_(i) is the expansion coefficient of the respective lens materialand T₁ is a temperature.

The following substitutions are yielded from the equation (7):

$\begin{matrix}{v_{{ref},i}^{{- 1},\lambda}\mspace{14mu} \text{:=}\mspace{14mu} \frac{{n_{i}\left( \lambda_{1} \right)} - {n_{i}\left( \lambda_{2} \right)}}{{n_{i}\left( \lambda_{0} \right)} - 1}} & (9) \\{v_{{diff},i}^{{- 1},\lambda}\mspace{14mu} \text{:=}\mspace{14mu} \frac{\lambda_{1} - \lambda_{2}}{\lambda_{0}}} & (10)\end{matrix}$

The following substitutions are yielded from the equation (8):

$\begin{matrix}{{v_{{ref},i}^{{- 1},T}\mspace{14mu} \text{:=}\mspace{14mu} \frac{{n_{i}\left( \lambda_{1} \right)} - {n_{i}\left( \lambda_{2} \right)}}{{n_{i}\left( \lambda_{0} \right)} - 1}} - {\alpha_{i} \cdot \left( {T_{1} - T_{0}} \right)}} & (11) \\{{v_{{diff},i}^{{- 1},T}\mspace{14mu} \text{:=}}\mspace{14mu} - {2 \cdot \alpha_{i} \cdot \left( {T_{1} - T_{0}} \right)}} & (12)\end{matrix}$

Converting the equation (7) yields the following relationship:

$\begin{matrix}{\phi_{{diff},i} = {{- \frac{v_{{ref},1}^{{- 1},\; \lambda}}{v_{{diff},i}^{{- 1},\lambda}}} \cdot \phi_{{ref},i}}} & (13)\end{matrix}$

Insertion into the athermalization equation (8) yields the followingrelationship between φ_(ref1) of the first lens (2, 12) and φ_(ref2) ofthe second lens (3, 13):

$\begin{matrix}{\phi_{{ref},i} = {\frac{{v_{{diff},2}^{{- 1},T} \cdot \frac{v_{{ref},2}^{{- 1},\lambda}}{v_{{diff},2}^{{- 1},\lambda}}} - v_{{ref},2}^{{- 1},T}}{v_{{ref},i}^{{- 1},T} - {v_{{diff},1}^{{- 1},T} \cdot \frac{v_{{ref},1}^{{- 1},\lambda}}{v_{{diff},i}^{{- 1},\lambda}}}} \cdot \phi_{{ref},2}}} & (14)\end{matrix}$

The Abbe equation (7) also yields a ratio between φ_(diff2) andφ_(ref2):

$\begin{matrix}{\phi_{{diff},2} = {{- \frac{v_{{ref},2}^{{- 1},\lambda}}{v_{{diff},2}^{{- 1},\lambda}}} \cdot \phi_{{ref},2}}} & (15)\end{matrix}$

Inserting this equation (13), (14), (15) into the equation (3) for thetotal optical power φ allows for a conversion of this value according toφ_(ref,2):

$\begin{matrix}{\phi_{{ref},2} = {\left( {1 - \frac{v_{{ref},2}^{{- 1},\lambda}}{v_{{diff},2}^{{- 1},\lambda}} + {\frac{1 - \frac{v_{{ref},1}^{{- 1},\lambda}}{v_{{diff},1}^{{- 1},\lambda}}}{v_{{ref},i}^{{- 1},T} - {v_{{diff},1}^{{- 1},T} \cdot \frac{v_{{ref},1}^{{- 1},\lambda}}{v_{{diff},i}^{{- 1},\lambda}}}} \cdot \left( {{v_{{diff},2}^{{- 1},T} \cdot \frac{v_{{ref},2}^{{- 1},\lambda}}{v_{{diff},2}^{{- 1},\lambda}}} - v_{{ref},2}^{{- 1},T}} \right)}} \right)^{- 1} \cdot \phi}} & (16)\end{matrix}$

The other optical power values φ_(ref1), φ_(diff1), φ_(diff2) can becalculated accordingly.

The values for the first lens (2, 12) and second lens (3, 13) calculatedusing this method enable compensation for top-level thermal andchromatic influences.

In another embodiment of this invention (shown in FIG. 3), thecorrection device (1) is designed as a secondary optical component (20)that is assigned to most of the light sources (22) arranged in a matrixstructure on a carrier plate (21). Ideally, the light sources (22) aredesigned as LED light sources and a primary optical component (23) isarranged in front of each in the main direction of the beam H.

In an alternative embodiment of this invention (shown in FIG. 4), thecorrection device (1) can be designed as a primary optical component(24) that is assigned to each of the light sources (22). Relativelyspeaking, the correction device (1) in this variant of the invention issmaller than the embodiments shown in FIGS. 1 through 3. A secondaryoptical component (25) designed as a lens is arranged in front of theprimary optical components (24) in the main direction of the beam H.This secondary optical component ensures that the stipulated lightdistribution is achieved.

In an alternative embodiment of this invention (not shown), thecorrection device (1) can have more than two lenses. Ideally, thecorrection device (1) has at least two refractive lens surfaces.

In an alternative embodiment (not shown), the diffractive structure ofthe first lens (2, 12) or the second lens (3, 13) can causeathermalization. In this embodiment, the refractive optical power causesachromatization. In the equation (13), the expression A would bereplaced with T and in the equation (14), the expression T with A.Accordingly, the Abbe equation (7) and athermalization equation (8) aresubstituted for one another. Even top-level thermal and chromaticinfluences are offset in this embodiment. Nevertheless, this requiresmore lens material, so the embodiment mentioned above is stillpreferable.

LIST OF REFERENCE SYMBOLS

-   1 Correction device-   2 First lens-   3 Second lens-   4 Refractive lens surface-   5 Diffractive lens surface-   6 Refractive lens surface-   7 Diffractive lens surface-   8 Flat surface-   9 Flat surface-   10 Optical axis-   12 First lens-   13 Second lens-   14 Refractive lens surface-   15 Diffractive lens surface-   16 Refractive lens surface-   17 Diffractive lens surface-   21 Carrier plate-   22 Light sources-   23 Primary optical component-   24 Primary optical component-   25 Secondary optical component-   H Main direction of beam-   n, n₁, Refractive index-   n₂

1. A lighting apparatus for vehicles comprising: a plurality ofsemiconductor-based light sources; a projection device for generating aspecified light distribution with a cut-off line a correction device ofthe projection device, said correction device having at least twolenses, wherein at least two of said at least two lenses are made fromdifferent materials from one another, where the surface of at least oneof the lenses is designed as a diffractive lens surface forachromatization in a visible wavelength range, wherein the surfaces ofat least two lenses are designed as refractive lens surfaces that havetheir optical power (φ_(ref1), φ_(ref2)) calculated based on atemperature range and/or expansion coefficient of the lens material ofat least two lenses such that adding the optical power (φ_(ref1),φ_(ref2), φ_(diff1), φ_(diff2)) of the lenses yields a predefined totaloptical power (φ) of the correction device.
 2. The lighting apparatus inaccordance with claim 1, wherein the refractive lens surface is designedsuch that the correction device is athermal.
 3. The lighting apparatusin accordance with claim 1, wherein the refractive lens surface isdesigned such that it is aspherical or spherical.
 4. The lightingapparatus in accordance with claim 1, wherein the diffractive lenssurface is structured such that the correction device is achromatic. 5.The lighting apparatus in accordance with claim 1, wherein thediffractive lens surface features a Fresnel structure.
 6. The lightingapparatus in accordance with claim 1, wherein a first lens and a secondlens each feature a diffractive lens surface and a refractive lenssurface.
 7. The lighting apparatus in accordance with claim 6, whereinthe sides of the first lens and second lens facing toward one anotherare directly adjacent and the surface of the first lens facing towardthe light source and the surface of the second lens facing away from thelight source feature a diffractive lens surface and refractive lenssurface.
 8. The lighting apparatus in accordance with claim 7, wherein amaterial layer is inserted between the first lens and second lens thathas a refractive index (n) that is between the refractive index (n1) ofthe first lens and the refractive index (n2) of the second lens.
 9. Thelighting apparatus in accordance with claim 1, wherein the correctiondevice is designed as a secondary optical component that is assigned tothe light sources arranged in a matrix structure and also to thecorresponding primary optical components that are also assigned to theselight sources.
 10. The lighting apparatus in accordance with claim 1,wherein a ratio of the optical power (φ_(ref1)) for the refractive lenssurface of the first lens to the optical power (φ_(ref2)) for therefractive lens surface of the second lens and/or a ratio of the opticalpower (φ_(diff1)) for the diffractive lens surface of the first lens tothe optical power (φ_(diff2)) for the diffractive lens surface of thesecond lens is formed through substitution in an Abbe equation and anathermalization equation, wherein a ratio of the optical power(φ_(ref1)) for the refractive lens surface of the first lens to theoptical power (φ_(diff1)) for the diffractive lens surface of the firstlenses and a ratio of the optical power (φ_(ref2)) for the refractivelens surface of the second lens to the optical power (φ_(diff2)) of thediffractive lens surface of the second lens is formed throughsubstitution in the Abbe equation and the athermalization equation,ensuring that an equation for the total optical power (φ) can be solvedbased on the individual optical power values (φ_(ref1),φ_(ref2),φ_(diff1),φ_(diff2)) of the refractive lens surfaces anddiffractive lens surfaces.
 11. A lighting apparatus for vehiclescomprising: a plurality of semiconductor-based light sources; aprojection device for generating a specified light distribution with acut-off line; a correction device of the projection device, saidcorrection device having at least two lenses, wherein at least two ofsaid at least two lenses are made from different materials from oneanother, where the surface of at least one of the lenses is designed asa diffractive lens surface for athermalization; wherein the lens surfaceof at least two lenses is designed as a refractive lens surface forachromatization in a visible wavelength range, wherein the optical powerof the refractive lens surface is calculated based on a temperaturerange and/or expansion coefficient of the lens material of at least twolenses such that adding the optical power of the lenses yields apredefined total optical power of the correction device.
 12. Thelighting apparatus in accordance with claim 11, wherein the refractivelens surface is designed such that the correction device is athermal.13. The lighting apparatus in accordance with claim 11, wherein therefractive lens surface is designed such that it is aspherical orspherical.
 14. The lighting apparatus in accordance with claim 11,wherein the diffractive lens surface is structured such that thecorrection device is achromatic.
 15. The lighting apparatus inaccordance with claim 11, wherein the diffractive lens surface featuresa Fresnel structure.
 16. The lighting apparatus in accordance with claim11, wherein a first lens and a second lens each feature a diffractivelens surface and a refractive lens surface.
 17. The lighting apparatusin accordance with claim 16, wherein the sides of the first lens andsecond lens facing toward one another are directly adjacent and thesurface of the first lens facing toward the light source and the surfaceof the second lens facing away from the light source feature adiffractive lens surface and refractive lens surface.
 18. The lightingapparatus in accordance with claim 17, wherein a material layer isinserted between the first lens and second lens that has a refractiveindex (n) that is between the refractive index (n1) of the first lensand the refractive index (n2) of the second lens.
 19. The lightingapparatus in accordance with claim 11, wherein the correction device isdesigned as a secondary optical component that is assigned to the lightsources arranged in a matrix structure and also to the correspondingprimary optical components that are also assigned to these lightsources.
 20. The lighting apparatus in accordance with claim 11, whereina ratio of the optical power for the refractive lens surface of thefirst lens to the optical power for the refractive lens surface of thesecond lens and/or a ratio of the optical power for the diffractive lenssurface of the first lens to the optical power for the diffractive lenssurface of the second lens is formed through substitution in an Abbeequation and an athermalization equation, wherein a ratio of the opticalpower for the refractive lens surface of the first lens to the opticalpower for the diffractive lens surface of the first lenses and a ratioof the optical power for the refractive lens surface of the second lensto the optical power of the diffractive lens surface of the second lensis formed through substitution in the Abbe equation and theathermalization equation, ensuring that an equation for the totaloptical power can be solved based on the individual optical power valuesof the refractive lens surfaces and diffractive lens surfaces.
 21. Thelighting apparatus in accordance with claim 1 wherein the correctiondevice is assigned each of the light sources arranged in a matrixstructure as a primary optical component, where a secondary opticalcomponent assigned to the same light sources is arranged in front of theprimary optical components in the main direction of the beam.
 22. Thelighting apparatus in accordance with claim 11 wherein the correctiondevice is assigned each of the light sources arranged in a matrixstructure as a primary optical component, where a secondary opticalcomponent assigned to the same light sources is arranged in front of theprimary optical components in the main direction of the beam.